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HERITABILITY OF SCHIZOTYPAL TRAITS DURING ADOLESCENCE
by
Marissa Ericson
A Thesis Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
MASTER OF ARTS
(PSYCHOLOGY)
December 2008
Copyright 2008 Marissa Leigh Ericson

The study described in the present paper attempted to clarify further the genetic and environmental etiology of schizotypal personality traits through biometric model fitting of data from a sample of MZ (n=91 twin pairs) and DZ (n=87 twin pairs) adolescent twins (age 11-13 years old) drawn from the general population. Univariate genetic analyses found that schizotypal traits are modestly heritable (additive genetic effects ranging from 35 to 49%). Multivariate genetic model fitting results indicated that additive genetic and unique environmental influences acted through a single common latent pathway for cognitive-perceptual, interpersonal-affective and disorganization symptom dimensions of schizotypal personality. The covariation among the three schizotypy sub-factors could be accounted for by a common 'schizotypy' latent factor which was significantly heritable, with additive genetic factors explaining 60% of the latent factor variance.

HERITABILITY OF SCHIZOTYPAL TRAITS DURING ADOLESCENCE
by
Marissa Ericson
A Thesis Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
MASTER OF ARTS
(PSYCHOLOGY)
December 2008
Copyright 2008 Marissa Leigh Ericson